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how can i fix my combi highflow 400?

my combi worcester 400 highflow when running hot water it will not maintain the temp goes cold then hot very erratic, any suggestions
steve brown, June 2008
either the inline mains water filter is partially blocked (remove and wash out) or the dhw thermister is faulty, or finally the dhw heat excahnger is scaled up and will need treating or replacing

T, June 2008
link Click here to see other fixes for Worcester.